Abstract: The semiconductor device includes a substrate, a first GaN field effect transistor, a second GaN field effect transistor, and a GaN diode. The first GaN field effect transistor is disposed on or above the substrate, and the first GaN field effect transistor is a depletion mode field effect transistor. The second GaN field effect transistor is disposed on or above the substrate, and the second GaN field effect transistor is an enhancement mode field effect transistor. The GaN diode is disposed on or above the substrate. The first GaN field effect transistor, the second GaN field effect transistor, and the GaN diode are disposed on or above a same side of the substrate and electrically connected to each other.

Abstract: The semiconductor device includes a substrate, a first GaN field effect transistor, a second GaN field effect transistor, and a GaN diode. The first GaN field effect transistor is disposed on or above the substrate, and the first GaN field effect transistor is a depletion mode field effect transistor. The second GaN field effect transistor is disposed on or above the substrate, and the second GaN field effect transistor is an enhancement mode field effect transistor. The GaN diode is disposed on or above the substrate. The first GaN field effect transistor, the second GaN field effect transistor, and the GaN diode are disposed on or above a same side of the substrate and electrically connected to each other.

Abstract: A photovoltaic power system includes a plurality of generation modules and a main communication apparatus. Each generation module has a photovoltaic panel assembly, a switch integrated apparatus, and a junction apparatus. The photovoltaic panel assembly has a plurality of photovoltaic panels electrically connected in series. The switch integrated apparatus has a control unit and a switch unit. The junction apparatus is electrically connected between the photovoltaic panel assembly and the switch integrated apparatus to collect electricity generated from the photovoltaic panels and deliver collected electricity to output terminals of the photovoltaic power generation module. The main communication apparatus is connected to the switch integrated apparatuses to turn on or turn off the switch unit according to magnitude of the output voltage, thus controlling continuously delivering electricity or discontinuously delivering electricity generated from the photovoltaic panels.

Abstract: The present invention relates to a power management system comprising at least one power management subsystem. Each power management subsystem comprises a first power module coupled to a first load and comprising at least one first power supply for supplying power to the first load; a second power module coupled to a second load and comprising at least one second power supply, wherein at least one second power supply is retractably installed in the second power module and selectively coupled to the second load; and a pass-through module comprising at least one pass-through unit retractably installed in the second power module to replace with the at least one second power supply and selectively connecting the first power module to the second load for allowing the first power module to supply power to the second load.

Abstract: The present invention relates to a power management system comprising at least one power management subsystem. Each power management subsystem comprises a first power module coupled to a first load and comprising at least one first power supply for supplying power to the first load; a second power module coupled to a second load and comprising at least one second power supply, wherein at least one second power supply is retractably installed in the second power module and selectively coupled to the second load; and a pass-through module comprising at least one pass-through unit retractably installed in the second power module to replace with the at least one second power supply and selectively connecting the first power module to the second load for allowing the first power module to supply power to the second load.

Abstract: A power supply comprises an input voltage detector that detects a drop in input voltage that corresponds to an input voltage loss. A power converter is coupled to the input voltage detector. The power converter, which may be a boost converter or a power factor correction converter, has a switching device that is actuated in accordance with a duty cycle. A duty cycle adjuster is responsive to detection of the drop in the input voltage to adjust the duty cycle of the switching device in order to limit an input current surge through the switching device below a desired level after the input voltage returns.

Abstract: The present invention relates to a power management system comprising at least one power management subsystem. Each power management subsystem comprises a first power module coupled to a first load and comprising at least one first power supply for supplying power to the first load; a second power module coupled to a second load and comprising at least one second power supply, wherein at least one second power supply is retractably installed in the second power module and selectively coupled to the second load; and a pass-through module comprising at least one pass-through unit retractably installed in the second power module to replace with the at least one second power supply and selectively connecting the first power module to the second load for allowing the first power module to supply power to the second load.

Abstract: A power supply having an specified hold-up time to take a input voltage and convert it to an output voltage, comprising: a first power stage to receive the input voltage; a second power stage to generate the output voltage and an output current; an intermediate charge storage device coupled between the first and second power conversion stages providing an intermediate output voltage in response to the input voltage; and a controller that controls the intermediate output voltage according to a voltage function that is associated with the hold-up time.

Abstract: A power supply comprises an input voltage detector that detects a drop in input voltage that corresponds to an input voltage loss. A power converter is coupled to the input voltage detector. The power converter, which may be a boost converter or a power factor correction converter, has a switching device that is actuated in accordance with a duty cycle. A duty cycle adjuster is responsive to detection of the drop in the input voltage to adjust the duty cycle of the switching device in order to limit an input current surge through the switching device below a desired level after the input voltage returns.

Abstract: A power supply having an specified hold-up time to take a input voltage and convert it to an output voltage, comprising: a first power stage to receive the input voltage; a second power stage to generate the output voltage and an output current; an intermediate charge storage device coupled between the first and second power conversion stages providing an intermediate output voltage in response to the input voltage; and a controller that controls the intermediate output voltage according to a voltage function that is associated with the hold-up time.

Abstract: The present invention relates to a power management system comprising at least one power management subsystem. Each power management subsystem comprises a first power module coupled to a first load and comprising at least one first power supply for supplying power to the first load; a second power module coupled to a second load and comprising at least one second power supply, wherein at least one second power supply is retractably installed in the second power module and selectively coupled to the second load; and a pass-through module comprising at least one pass-through unit retractably installed in the second power module to replace with the at least one second power supply and selectively connecting the first power module to the second load for allowing the first power module to supply power to the second load.

Abstract: The present invention relates to a current control circuit for controlling inrush current through an energy storage capacitor of a power supply having an input voltage. A semiconductor device is coupled in series to the energy storage capacitor; and a control circuit produces a constant current through the semiconductor device during an inrush current period when the energy storage capacitor is charged by the input voltage to reach an energy storage capacitor voltage that causes the semiconductor device to act as a short switch.